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AT49F020 Datasheet دیتاشیت PDF دانلود

دیتاشیت - ATMEL - 2-Megabit 5-volt Only Flash Memory

شماره قطعه AT49F020
شرح مفصل 2-Megabit 5-volt Only Flash Memory
تولید کننده ATMEL 
آرم ATMEL 


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AT49F020 شرح
Features
Single Voltage Operation
– 5V Read
– 5V Reprogramming
Fast Read Access Time - 90 ns
Internal Program Control and Timer
8K Bytes Boot Block With Lockout
Fast Erase Cycle Time - 10 seconds
Byte-By-Byte Programming - 50 µs/Byte
Hardware Data Protection
DATA Polling For End Of Program Detection
Low Power Dissipation
– 50 mA Active Current
– 100 µA CMOS Standby Current
Typical 10,000 Write Cycles
Description
The AT49F020 is a 5-volt only in-system Flash Memory. Its 2 megabits of memory is
organized as 262,144 words by 8 bits. Manufactured with Atmel’s advanced nonvola-
tile CMOS technology, the device offers access times to 90 ns with power dissipation
of just 275 mW over the commercial temperature range. When the device is dese-
lected, the CMOS standby current is less than 100 µA.
To allow for simple in-system reprogrammability, the AT49F020 does not require high
input voltages for programming. Five-volt-only commands determine the read and
programming operation of the device. Reading data out of the device is similar to
reading from an EPROM. Reprogramming the AT49F020 is performed by erasing the
entire 2 megabits of memory and then programming on a byte by byte basis. The byte
Pin Configurations
(continued)
PLCC Top View
Pin Name
Function
A0 - A17
CE
OE
WE
I/O0 - I/O7
NC
Addresses
Chip Enable
Output Enable
Write Enable
Data Inputs/Outputs
No Connect
A7 5
A6 6
A5 7
A4 8
A3 9
A2 10
A1 11
A0 12
I/O0 13
29 A14
28 A13
27 A8
26 A9
25 A11
24 OE
23 A10
22 CE
21 I/O7
2-Megabit
(256K x 8)
5-volt Only
Flash Memory
AT49F020
TSOP Top View
Type 1
A11
A9
A8
A13
A14
A17
WE
VCC
NC
A16
A15
A12
A7
A6
A5
A4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32 OE
31 A10
30 CE
29 I/O7
28 I/O6
27 I/O5
26 I/O4
25 I/O3
24 GND
23 I/O2
22 I/O1
21 I/O0
20 A0
19 A1
18 A2
17 A3
DIP Top View
NC
A16
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32 VCC
31 WE
30 A17
29 A14
28 A13
27 A8
26 A9
25 A11
24 OE
23 A10
22 CE
21 I/O7
20 I/O6
19 I/O5
18 I/O4
17 I/O3
Rev. 0567C–10/98
1

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